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Here is a piece of your garden variety Ulexite. I hadn’t noticed this listed here yet so I threw it in for diversity. It is from the Boron Pit, U.S Borax Mine, Boron, Kramer District, Kern County, California and measures 4 5/8" x 3" (11.75 x 7.62 cm). (Author: Jim Prentiss)
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